TMG can't let me to open my web site Panel.

Hello.

I use TMG 2010 on my Gateway with some rules. I have a rule with the name NAT and everyone that add to this rule can use Internet without any limitation. I added my IP address to this rule but when I want to go to my Cpanle of web site it show me an error and web page can't open. I attached a photo.

What is your idea?